Liz and Wendy were curious about something their anatomy professor had said. He was talking about the male reproductive system, and someone asked about prostate stimulation. They both giggled at first, but became more and more curious about whether it was true that men would ejaculate more if they had their prostate massaged.
"Why don’t we do an experiment," Wendy suggested. "Have you tried it with Dave," Wendy asked. Dave was Liz’s boyfriend.
"No way. He’s a prude when it comes to assplay," Liz lamented.
Wendy was “between boyfriends,” partly because her huge tits were intimidating for most nice guys who were boyfriend material, but mostly because she having too much fun with the naughty guys.
"What about craigslist," Wendy suggested. "We could put in an ad for research subjects." They agreed to do just that, and were careful to make the post look very scientific.
They bought a dildo and waited for subjects to respond. Their first response came from a screened email address. They explained what they wanted to do, measure the volume of ejaculate, with and without prostate stimulation. The guy said he wanted to try it, but wanted to make sure it wasn’t “gay or anything.”
They reassured him, and agreed to meet in a neutral location. There was an old basement bunker under the science building. Wendy and Liz wore their most professional looking dresses to meet their first subject.
Wendy’s jaw hit the floor when she opened the door to see Liz’s boyfriend Dave standing there. After some awkward laughter and conversation, they agreed to go forward.
"I’ll do the prostate," Liz explained, grabbing the dildo and the lube as her boyfriend undressed. Wendy was busy staring at Dave’s fat, hardening cock.
Dave took a seat in the middle of the room and Liz knelt in front of him, lubing up the dildo. Wendy squatted beside him, trying hard to hide her excitement. ”This is for science,” Wendy lied as she grabbed Dave’s cock.
Liz could tell her friend was getting excited, and tried to fight her own building excitement. She lost that battle, and savored the butterflies as she pressed the dildo into her boyfriend’s ass.
Liz was focusing on keeping the rhythm with the dildo, and didn’t notice her boyfriend’s left hand slip off his leg and onto Wendy’s. She noticed a familiar smell, and heard the soft, wet sounds. She glanced over to find her boyfriend fingering Wendy as Wendy stroked his cock.
"Do you like her tits, Dave." she asked her startled boyfriend. He didn’t answer. "So do I," she admitted, pushing the dildo deep into his ass. "She likes your cock. Your big, fat cock. I knew she would," Liz continued. "That’s why I kept it from her."
Dave began to tense, and let his head fall backwards as he fingered Wendy. ”Do you like that,” Liz teased. ”If you want, I’ll let you fuck her. Would you like that?”
That was too much for young David, who grunted and shot his massive load high into the air. Cum landed on David’s chest, Liz’s arm, and on Wendy’s dress.
"Whoops," Liz said somewhat sarcastically. "We forgot to measure it. I guess we’ll have to try again." She looked at her boyfriend. He was spent and his cock was already soft. "Maybe Wendy and I should get you back in the mood," Liz offered, wiping her boyfriend’s cum off Wendy’s breasts and licking her finger clean.