I don't know what to say . . . Vincent gives her what she needs, and he doesn't particularly mind being in that situation. Like, Ariel craves physical contact, assurance about who she is and what she does, and so on, so he just keeps doling it out. It's not even part of a bigger plan or anything; he just acts as a counter point and safe haven for her. Vincent really appreciates the finer points to her, even if he's not taking with their relationship. In that same logic, he slept with her, because she was upset about Shadowchild leaving. It was a distraction tool, and it's the best one that Vincent has in his play book.

Idk more stuff if you want it

Who exactly is Mukuro sleeping with . . .