Ianto was trying. He was trying hard to do what tricks he could given the situation they were in to get the other man to climax too, but it just wasn't coming. There was something in the sounds that Sulu was making that gave him pause as well, to some extent. Whining for release itself wasn't what caught Ianto's attention, but the tone of it. Hell, it'd been a long time for him to last, and he was used to playing with drawing things out with Jack, but Sulu... Sulu wasn't, as far as he was aware.

Ianto slowly removed his finger from pressing against that spot inside of the other man, moving to rest his hand on the other man's lower back as he slowed the pace a little with his hand, afraid that he was overstimulating the man like that. "...are...are you alright?" he asked, his voice a little hoarse and breathy, but also slightly concerned.