Fluff
1. (Character one) calls (character two) over to hang out.

Smüt (kill me)
1 . Omagerverse: (character one) is in heat and (character two) has to help them.

Angst
1. (Character one) is ill, at the world meeting nobody except (character two) notices

Adoption
(The child will be a state)
1.(character one) and (character two) believe they're ready to have kids, but are incapable of having them naturally and so chose to adopt.

2. (Character one) and (character two) have adopted a child, unfortunately they:
Are not interacting properly with other kids
Are extremely violent
Refuse to talk with them
Are very untrusting