Neither Patroclus nor Deidameia are enjoying what’s happening. Deidameia seems to want Patroclus to be into it, though, presumably because that would be an affirmation of his attraction to her and that he genuinely betrayed Achilles. But, if she feels a moment of power during sex, that feeling disappears as soon as it is over. In that moment afterward, she accepts that Achilles does not care about her in the way she wants him to. Meanwhile, this is the second time Patroclus has chosen to pretend that a traumatic event (each in some way related to women) was a dream. As with the oath, this seems to be a way for Patroclus to avoid responsibility.