Martin a fellow classmate

"Ahem, Mr Barclay asked me to come out and tell you to stop banging on the walls." Martin told the pair, eyeing Ayumi's tits hungrily as Ken pulled back.

"Sorry about that," ken said brightly, tucking his dick away, "would you like to have a turn?" Ken offered.

"What? Wait you can't just go offering me around..." Ayumi started to say then checked the rules,

"A partner can their services to any they wish." Ken finished for her, "And aren't we lab partners?"

"Well yes, but surely..."

"Then what's the fuss let Martin have his turn."

Ayumi sighed, but didn't cover up, keeping her legs wide for Martin as he took Ken's place between her legs and then once more she was getting fucked against the wall.