This was really the only part that was uncomfortably new, but even if Theodore had wanted to tell Blaise that he wasn't accustomed to it, he didn't have a chance. Which was better, really - he didn't think, just reacted, eyes closing as he broke the kiss to gasp for breath.
Having his mind invaded was one thing; Blaise being inside him physically was quite another. He couldn't help but tense at first, but that didn't make it easier, he knew that from his medical training. Thankfully that occurred to him instinctively, and he breathed out, relaxing as he got accustomed to it.
It was much easier to get used to it when Blaise was moving slowly, creating a different kind of friction, with Theodore's erection trapped between them. His breath was coming in ragged gasps, fingers digging into Blaise's skin hard enough to bruise, but in a good way; the sensation had completely overwhelmed him, mind and body. Probably the best thing was that he knew, at least somewhat, what it felt like on Blaise's end, and to be making someone else feel like that...
"Fuck," he breathed out, eyelids fluttering, and lifted his hips in offering when he felt ready for more, grinding up just a little to get more sensation.