wake-up call (слэш)

Ren narrowed his eyes at the bulge, the morning wood he'd noticed on more than one occasion.
There had been plenty of other times he'd seen Horohoro hard, plenty of times he'd looked with disinterest and Horohoro had flushed and gotten harder. There had been plenty of times Ren had seen Horohoro looking at him too.
If kicking and yelling didn't wake him, didn't rouse him, then perhaps arousing him instead would be a more successful tactic.
OR
Ren is tired of Horohoro sleeping in and delaying their training, so he decides to Do Something About It