This is either cute if it's happening after they had some fun, or really pitiful/creepy if she's kissing him after he jerked off.

I think it's the former, as the latter scenario just cannot register as likely in my mind.

Yeah. Him sitting at the computer just strikes me as a little suspicious.

This is from the H-doujin [Keumaya] Koi suru Haruhi wa setsunakute, Kyon wo omou to sugu ecchi shichau no.

And I can say without doubt that they were having sex, for quite a while.