Sympathy

Her face is red as she points at your turgid member, glancing away out of bashfulness. She lets out a tiny, quiet "Did I... cause that?"

You can't even bring yourself to admit that, yes, this was from her. Still, the look on your face seems to be all the answer she needs.

"That can't be... I'm all... athletic... why would you react that way to... me?" she says, her voice even smaller as her own insecurities cloud her self-image.

She looks at your face, her eyes softening in sympathy and even a hint of guilt. "Does it hurt? Is it uncomfortable?"

You shrug. "A little?" It probably won't get sore unless it stays tumescent for a while, but... You kinda feel like confirming her question is the right thing to do.

Frowning, Aoi steps over to the edge of the pool, pulling herself up onto the edge and spinning around to sit with her legs dangling in the water. You let out a strained groan at the sight of her ample breasts bouncing from her athletic movements, feeling your above-average cock throb in the water. Her face still tinted red, she pats her lap and gives you an awkward smile.

"C'mon. Rest your head here. I know this must be hard for you, so... I guess this is the least I can do for, um... causing that?" She reflexively glances at your hand-cupped erection.

Oh boy... You've got a gorgeous, curvaceous swimmer, offering to give you a clothed-female-nude-male lap pillow as recompense for the erection she gave you? How on earth are you supposed to react to this?