GraTsAnna (Gray x Natsu x Lisanna)
-Whenever Natsu and Gray are about to return from a mission, Lisanna waits for them as one of her Animal Souls. When she sees them she rushes back to their house and starts preparing a muscle soak bath with the EXACT conditions that would make both boys comfortable.
-Tying in to the previous headcanon, Lisanna makes Natsu and Gray dinner while they’re bathing together.
-Natsu and Gray used to argue over who got to be in the middle because they both wanted to cuddle Lis as well as each other. Eventually, Lisanna worked out a schedule for both them and her because she wanted to cuddle both her boys.
-In the summer Gray and Lisanna kick Natsu out the bed because he’s too warm, it’s vice versa in winter when Natsu and Lis kick Gray out because he’s too cold, the rest of the time though it’s the three of them sleeping comfortably together.
-Every April Fools’ Day, Natsu and Lisanna get a marker and doodle on Gray’s face while he’s asleep, after realising what they’ve done he gets his revenge by putting ice cubes down their backs, regardless, they still do it every year without fail.
-Gray’s favourite thing to do for Natsu and Lisanna when they’re at the beach during the summer is to cool them off with his ice.
-When they first began their… intimate activities Lisanna was in the middle and before it happened for the first time both Natsu and Gray asked Lis at least 100 times each that she was okay with it for their first time.
-Whenever Lisanna goes out on a mission with her siblings she makes sure the bed is prepared for Natsu and Gray, complete with rose petals and a bottle of wine as well as the scent of wood smoke (something Gray and Natsu both enjoy).
-If some sleazy guy tries to get suggestive with Lisanna, both Natsu and Gray will proceed to give him an appropriate ass-kicking.
That’s all I’ve got, thanks for asking!
Send me an OT3 and I'll come up with some headcanons!