There was something strangely invigorating about the power imbalance of the situation. It would be incredibly easy to tip the scale from pleasure to pain, and yet the man above him didn't seem worried about that at all. It was tempting to bite down.

But it would be more interesting to see how close he could get to doing so before the man caves and shoves him away. The younger man's jaw loosens at Akutagawa's thrust, allowing him deeper--only for his sheer girth to not give his teeth much room to avoid him. Sharp tips press more firmly against the skin of his shaft as his tongue swirls to brush against where the tips meet.