the poor but sweet f/o that doesn't have a high vocabulary or can never think of how to vocally express their feelings. it takes them a long time to come up with things to say, to tell you about how much they appreciate and love you, or how you make them feel loved and cared for.
situations where they suddenly go up to you on just a random normal day, put a hand on you and lock eyes with you, and say without warning. "I love you. Thank you for loving me." then they give a small kiss or pat before walking off, probably extremely flustered, leaving you standing there just kinda confused.
where you're about to leave them for a small while for whatever reason, and they stutter a bit before saying "Be safe, please. I love you. Have fun." they close the door for you and when they're sure you're gone they let out a big sigh and try to shake off their feeling of worry
after a date when you've been brought home to be dropped off or you both come home together, they're silent until you're at the door, gently taking your hands and squeezing them. feeling a hard pulse through their palms before they take a deep breath. "I really liked tonight. I loved it. I love being with you, talking to you, having you with me. Thank you for tonight, really. You mean a lot to me." they lean in and give a soft kiss to your cheek and lips before you both either go opposite ways or go back to your room to sleep, either way they feel all nervous and giddy when they get in bed and think about you
they do their best to make up for their silence, and even though they don't need to, and they've apologized for it and you've told them it's fine because you know they love you even when they don't say it often, you appreciate their effort nonetheless