I leaned forward and cupped her left buttock with my hand. She jumped slightly, then pressed back against my hand. I squeezed her butt-cheek, then brushed my hand across her pussy to the other buttock. She jumped even more at that, and I heard a sigh. She'd stopped looking for the tablets, and was just holding still, pressing back slightly against my hand.
Taking this as a sign of approval, I moved my hand back to her pussy and ran my hand forward between her legs. I could feel the warmth, and as she moved her legs apart a little, there was a definate dampness.
My cock was standing to attention and ready for action at this point. It was clear to me that she was also ready, able and willing. I kept caressing her pussy with my left hand, whilst using my right to pull my shorts and undies down to my ankles.
When I took my hand off her pussy she gave a soft whimper, but as my hands took hold of the waistband of her shorts the whimper turned into a moan of anticipation. Sliding the shorts over her bum, then down her thighs, I caught a glimpse of her soft, wet, inviting, shaven pussy.
She stepped out of her shorts, and spread her legs again. At the same time she lifted her torso up, rested her arms on the edge of the sink and put her head on her arms. I moved forward, put my hands on her hips, and positioned my cock at the entrance to her cunt, pushing just the first centimeter or so in. Then I held still for a moment, teasing her.
Suddenly she pushed back, taking my entire cock into her cunt, her buttocks banging against my thighs. The warmth and wetness of her cunt as it engulfed my cock felt really good, and I hoped it felt as good for her.