Yes

Myrcella tears up but there is nothing she can do as cersi tugs her away .as they are leaving Jon thinks about his actions and slightly regrets it but in the moment his lust had took over him .

Jon decided to not ponder over it and instead return to his room for the night and deal with this the next day .

The next day he walks around the castle nervously but walks past Cersi room and hears moaning louder than last time but as there were no more secrets he decides to blatantly walk into the room and sees what he had expected Myrcella panting whilst cersi roughly used her false cock to penetrate her ass .Cersei notices Jon and says “looks like we have a guest now” and ushers Jon to come closer .