I was actually impressed by her work. Insulin would have been unstable in the protein pocket by itself due to some exposed binding sites on my protein...package. Instead of redesigning the package, she had designed a protein that was small enough to fit inside the pocket with Insulin, but that would cover the binding sites. I do apologize for the technical jargon but I found her discovery very interesting. I noticed that while I was reading, she devoured her Frap as if Starbucks was going out of. It’s more like your thick honey rather than the thin runny stuff you guys leave behind and it’s engineered to resist the pumping action of another dick from drawing it out. The convolutions are hard keratin ridges that increase stimulation and friction and the extra length encourages the opening of the brood pouch in our females. As for the sack, what do you guys do without it? It stores semen that would normally be ejaculated when I cum, it’s not released until the sack is full. That means. She was still a lot tighter than Lee and the way her pussy clung to my shaft seemed to be pulling me closer to cumming.This time when I went to kiss her she let out a loud moan then pulled me down on her body . She was sucking on my neck while her arms held me tight “cum for me “she said ,so I did. Again she cried out “yes “ louder as again I started filling her pussy. I could almost feel my sperm floating around my cock as it made its way into her womb.Her pussy squeezing as if wanting to. .oooohhhhh………hmmmm……I came in her ass that day but my dick smelled bad after fucking the ass.i washed it from the first aid room tap but the stench didn’t come off for days.after that I didn’t try ass again for a long time.Time went by like this and we tried all sorts of role play sessions.we even imagined a class room was a house and made scenes where I would be a neighbor kid,a salesman,complete stranger……all sorts of situations.One day she told me to skip two periods and come to the science.