Firstly he wants her tits

The door opened and the two people he had expected came in. The Professor didn't even bother to greet him, he instantly walked over to the products and keep taking stuff he needed.
The girl also did not lose time and walked over to him. She was dressed in something like a coat, just... short. It was shorter than her hair, so not for the first time, he saw her moist and cleanly shaven pussy.

His already hardening member skipped various stages of erection and went full ahead to steel mode.

"I... waited for you... would you mind if...." She silenced him with a look into his eyes. She had such an intense look. He felt scared to ask of her what he wanted.

Without another work she started to pull down his pants and started to lick his erection. Her soft and rather tiny tongue swirled around, covering him completely. He was unsure how she was able to do this, but he was sure that even sex with other women would not be comparable to only the mouth of this one. If only he could....

"Let me fuck your titts" he blurted out. She got slower and slower until she stopped. Releasing his member out of heaven, he thought he had blown it as she sighed.