Spoiler (click to show/hide):
Right is professor Indigo, not violet, derp
Raula just giggled and smirked at you, her telepathic ability to grope you prodding there again as she purred into your mind,
"Oh but why not~? I hear if you press somewhere within, it can make sex feel even better for males~ and its just the three of us... and in about five minutes, the Professor will forget we're even around~" Nevertheless, she didn't stop you from pinning her to the shell, rubbing her lower body back against you.