Nope more like he has been developing feelings before he thought Inseop was up to something. This is the very reason we're here right now, because he felt betrayed by him. But instead of torturing him like what he usually does to those who have crossed him, he forced, locked and keep him by his side. Even his jealousy and possessiveness has been evident since then.
But Wooyeon has never experienced to fall in love even before. He is a twisted person. Even his parents already gave up on him that he thought he can just act what seems acceptable by others. That's why everything with Inseop is new to him. He can't even point out whatever he's feeling right now.
So the seme falls for the uke after fucking him???