[Rin momentarily stiffens at how...forward he is, but finds herself closing her eyes and pulls him forward a little by putting her hands on each side of his face, returning his kissing by capturing his lips with hers after he nibbles. Her tongue flicks a bit against his lower lip, before she pulls away, flushed, but with a bit of a glint in her eyes.]

I'm embarrassed enough to want you to myself like this in a more private setting, Oikawa-kun. [She arches an eyebrow, smirking a bit.] Think of it...as me being open to lending you more support than simply cheering you on at a game.

[She winks.]

Just a thought.