Asexual Cuddling Prompt
Person A is asexual and in a poly relationship with non-asexual persons B and C. At first A is totally fine with B and C having sex, in fact they're relieved, as not having sex has been a point of tension in A's past relationships (maybe an ex also made them feel guilty/insecure for not having sex). A is really happy and loves cuddling with B and C. Eventually, A realizes that B and C (who usually aren't cuddlers) only really snuggle together after sex. A feels really insecure and conflicted about joining them, thinking after sex is B and Cs' Special Time and that they aren't allowed to join, eventually leading to A becoming unhappy and distant from B and C. B and C frantically try and figure out what's wrong, and when they do, they cuddle A for hours and shower them with love and reassurance that A is always welcome.
Bonus points if, after A is reassured, they fake complain/tease B and C for being so sweaty and gross from sex when the three cuddle.
Extra bonus points if B and C are in a Dom/sub relationship that A has always felt excluded from, and A is super excited to have found a way to join in the way of aftercare. A always has snacks and blankets and cuddles and praise prepared for after a scene.