Oscar brought in all of the stuff he would require, a ruler, a stopwatch and something else that was in the back of his hand that I couldn't quite see.
"Alright then, we're ready to go" Oscar said to Josh. "Right so do you want me to just take off my shorts and underwear?" I asked, unsure of how I got into this situation.
"Studies have actually shown that being completely naked increases levels of arousal," Josh said.
"Righto then," I said, slightly horrified that my little brother was about to see me but naked. I took off my shoes and socks and put them on the couch behind me. I whipped off my shirt, showing off my abs and hardened pecks, and put it with the rest of my clothes. I edged down my shorts, which were admittedly too tight for me, leaving me in just a pair of Calvin kleins grey underwear. Oscar jotted down something on his clipboard, and then looked up, waiting for me to take off my undies.
I looked at Josh, "are you sure about this?" I asked. "as long as your not uncomfortable I don't really care".
"Don't say I didn't warn ya," I said to myself, before edging down my Calvin Klein's to reveal my flaccid cock to my brother and his best friend. I took the undies right off and put them in the pile on the couch, so I was standing there wearing nothing in the middle of the room. My hands naturally moved to cover my cock, leaving me standing their with my balls pushing through my hands, in front of my baby bro.
Oscar moved forward with his ruler and handed it to Josh. "Um, Andy, can you move your hands so we can measure your dick?" Josh said, overwhelmingly embarrassed by the situation. I moved my hands to show my overwhelmingly huge shaft. Josh couldn't stop staring. His mouth was gaping wide at the sight of my member.
"Josh," I said somewhat awkwardly, "Lets do this mate."
Josh snapped out of it and moved towards me with the ruler, he crouched down, so he was in line with my massive cock and reached his hand out to touch it.
The second Josh's hands touched my cock I felt a shiver run through my body. His cold hands on my shaft made me feel tingly and awkward. Josh got his ruler out and pulled my cock so it was perpendicular from my body "15 cm flaccid" Josh called out.
"Jesus Andy, I think id struggle to make that hard," Oscar said shocked.
Josh was still holding my dick seeing if he got the measure right and I felt uncomfortable with the growing attention. "Are you right down there mate," I asked Josh, who quickly moved away after I asked the question. I could see his crowing embarrassment and decided to make a joke of it. "I understand it might be a little bit big Baby bro, but try not to stare," I said to him as he walked back towards the results. Oscar laughed.
"Right, so can I put my clothes back on now?" I asked, ready for this to be over with.
"Andy, we've only got the before measurement" Oscar said, showing me the gaps in his data. We need to time how long it takes you to get hard under different circumstances.
My face went beat red at that. "What" I said nervously, "I thought you wer just measuring me."
"Do you even know what sexual arousal is Andy," Josh asked, questioning his brother's intelligence.
" All I know is that I didn't sign up for this," I shot back," I'm out."
"Oh come on Andy you pussy, don't back out now," Oscar pleaded.
"You want me to wank in front of my little brother so he can see how long it takes me to get hard" I wasn't backing down.
"If you do this Andy, I owe you one," Josh said, with one last effort.
I had a light bulb. I wasn't the sharpest tool in the shed but I knew the perfect way to get back at Josh and give the boys an A in their science assignment.
" I will only do this if we change the assignment a little bit," I said, moving my hands from my cock to by my sides, giving the boys a five star view. "instead of sexual arousal we do proper sex. Lets compare the time it takes a straight male to cum when having sex with either genders." I said, adding a thrust at the end for extra effect.
Josh stared at me. "you want to have sex with another guy"
"This will get you way better marks and I'm not going to be the one taking it."
"Who in the entire bay will agree to take that" Josh asked, gesturing to the monster hanging between my legs.
"You will, baby bro." I said, a wild grin emerging on my face. "after all, you owe me one."