I really like it when sex is implied in a story, and not explicit. If I wanted porn, I'd go to... another website, and not here. This distracts from the story that I actually came to read, so.
Not saying I don't like eye candy, but I don't want to be hit in the face with someone fucking when I can find it just about anywhere else on the bloody internet. Give me more plot, god damn it!
On a side note, I agree with what
@Rickymex is saying. If that was me, I'd put on full-display what he can do during this subjugation as an example she can watch and learn from (since it's basically a situation where they are of one body, in the sense that he doesn't have to protect a completely separate entity since they're on the same ship), use it as something she can aim for, and let her learn from there.