Stefan pressed closer to Elena and claimed her mouth. His hand moved from her thigh to cover Damon's, on her hip, as he fitted himself against the pair.
He hoped that Damon could manage to not bite Elena in front of him, though should he indulge, the younger Salvatore was prepared to bolt. He didn't have any illusions of being able to get anything out of this for himself--it was for Elena, and Damon. His brother had something to prove, though Stefan didn't know whether it was to prove to Elena that Stefan would be privy to Elena's most intimate moments, or to prove to Stefan that he could be made to be wherever Damon wanted him. Either way, he wasn't here for himself, and he only hoped to be a worthwhile addition, and not an intrusion.