i don't talk enough about my headcanons involving fukumori specifically while mori's pregnant* during the bungou stray pups universe timeline events, and that needs to change tbh.
so, take some mostly transposed from twitter with some tumblr originals mixed in:
imagine heavily pregnant mori stealing fukuzawas clothes because it's both easier and less stressful than buying tailored clothes of his own. he mostly does this to avoid reminding himself most commercial pregnancy clothing is labeled as "maternity wear, but also because fukuzawa tells him how precious/hot he looks wearing his clothes while heavily pregnant anyway so it's a double win
fukuzawa cuddled up to mori during the last days of his pregnancy making sure he's as comfortable as he can be as mori sleeps more than he's ever slept before because he can be safe knowing that fukuzawa's there for him
when mori's in the second and third trimesters and the poor guy's just. aching constantly (he should get an award for carrying his husband's bigass kids because they didn't get their size from mori), so fukuzawa's often rubbing his back/feet for him
fukuzawa feels bad about the physical strain on mori too and knows he can't really do anything to stop him from aching since it's kinda part of the process so he does what he can to ease it while also saying variations of "sorry for doing this to you" while mori grumbles halfheartedly at him
despite all the pouting and whining he does, mori never really blames anything on fukuzawa, because he knows as well as anyone that this is just how it goes, and also knows that fukuzawa could be treating him so much worse, because he's been treated worse in the past (see my completed, multi-chapter, minor angst with an impossibly fluffy and sweet happy ending, fukumori babyfic "dog days are over" for more details on uh, all of that)
speaking of that tho, mori getting emotional over how sweet fukuzawa is to him is >>>>. not even because mori thinks he doesn't deserve it (he does, but that eases with time, more and more as time goes on, and more easily than anyone expects it to), but just because he's already so emotional with more hormones running wild inside of him than he knows what to do with or has had to deal with since he started testosterone honestly, and unable to hold back those emotions like he usually would instinctually (even though fukuzawa's been trying to coax him into being more open ever since the relationship started but he also knows these things take time)
you know the ADA & PM threw them a surprise baby shower (to mori, at least, fukuzawa knew about it in order to keep mori from knowing about it, and kept him distracted while they were setting it up) too, and mori wept tears of joy when they came home from a "spontaneous day out" to it. he naturally immediately threatened everyone there with a fate worse than death if they told anyone about his reaction, and even though they knew he was absolutely not being serious at all, they don't mention it outside of the attendants lmao
also, fukuzawa holding mori as close as he can, as often and as much as he can, whether they're laying down in bed/on the couch/etc or not, touching him and holding his face and his hands etc, so gently and tenderly, not because he thinks he's "fragile" or anything, but because he loves him so much, mori and their baby both, and they're both so used to only being violent or touch being accompanied with pain or violence that every time they touch and hold each other tenderly is a reminder of how far their lives have come, and a reminder to mori that, this time, their child will grow up with two fathers who love and care about them and want to keep them safe and hold them close and gentle because they love them, and this time mori doesn't have to do it alone, he doesn't have to be the only one trying to save his child (and ultimately, the only one who suffered when he lost her)
fukuzawa resting his head on mori's belly and tracing circles on it with his thumb, cooing softly to their baby while mori knits them a lil stuffed animal to give after they're born (it's a wolf pup) along with a baby blanket
mori being very, very pregnant, but still trying to do things on his own, and hissing at fukuzawa like an angry cat when he tries to help, only to realize he can't properly do the thing and reluctantly letting fukuzawa help as he pouts off to the side lmao
and of course, mori feeling frustrated at "being useless" while pregnant, and fukuzawa saying "you're literally growing a person, inside of your body, with your body's limited resources, all while still also doing things, right now. i don't think that's quite right, my love"
tbh i will never not be weak for fukuzawa being totally enamored with mori growing a little person, their little person, in him because how can i not be. it's precious and also he would be
and of course, head always full of thoughts of. fukuzawa cuddling with mori while he's pregnant and always keeping his hands on mori's belly. mori loves being held by fukuzawa because he feels safe and also loved and also thinks it's absolutely precious how protective fukuzawa gets too. they also are both so very enamored with and in awe of the physical representation of their love, the proof that their baby is healthy and growing and they'll get to meet them soon. they're so in love with their precious little thing long before they arrive and they've never been happier about anything in their lives before
*note: i headcanon mori as a trans man, for those who are new to my blog/posts on here. pls don't tag this as like, omegaverse or au or anything, bc it's Not, it's just canon divergence. heavy canon divergence lmao but canon divergence nonetheless bc this is very much still with the intent of being in the general bsd universe