that feel when your quirk is also a sexy eldritch horror you can only KINDA control (слэш)

Izuku was happy as could be. In his final year at UA, the world was at peace, his grades were up, he was considered one of UA’s Big Three. He had job offers out the door waiting for him when he graduated, he was dating the prettiest guy around (one Todoroki Shouto), and he had complete control over his quirk.
Correction.
He used to have complete control of his quirk.
For some reason Blackwhip decided it liked Shouto.
There had been more than a few cases of Blackwhip misbehaving. Most of which had proved to be humiliating. Up until now, Izuku was very fond of Blackwhip. It gave him excellent mobility, made for a great capture device, its uses in combat were almost limitless. Not to mention the day to day! Remote too far? Blackwhip! Forgot to close the door and already sat down? Blackwhip?
Boyfriend walks by you wearing the jeans that make his ass look Really good? BLACKWHIP.
Maybe that was the issue. He’d slapped that cute little Todoroki Butt too many times and now that Blackwhip had a taste... It wanted the whole meal.