I felt her hips rotating as she writhed and squirmed, ramming herself down onto my cock, she was cumming and cumming hard.She bit my neck and squashed...her breasts into my chest, gasping for breath, she relaxed her bladder muscles and flooded me."I can't stop it, Tommy, I can't stop cumming, shag me, baby, shag me fucking hard.,”My own orgasm was no less powerful, it seemed to begin in my brain and spread outwards until I was tingling all over, even my feet tingled as she went limp and collapsed. ..I don't know what got into me, Shanna. Please forgive me. I just have to get out of here, call one of your friends over for the night or something. Shanna, I have to go." She placed herself in front of me, blocking my path, and reached out, taking hold of my hand."Don't leave, Jerry. You can't just keep running away from me, I want to talk about this. Please..." The intense look of pleading in my beautiful little sister's eyes was almost overwhelming. She was right, I couldn't keep running. He raises his hips and begins frantically fucking my hand as his warm cum erupts from the head of his cock into the soft silky substitute vagina made by my underwear.As he fucks my hand, I try to match his spurts and ejaculations with my stroking. I pull, stroke and tease, squeezing and milking him into my panty.More careful now, I hold the panty to his cock and gently match his exertions. I take my time with him, softly now, softly as his ejaculations continue until his hips slowly sink back. Of course, we started off with a lecture on gun safety and made sure that the people knew where to find the gun’s safety switch. These paint-guns were identical to the real assault rifles except for the ammunition fired, so it was easy to transfer the practice with the paint-guns to the assault rifles.We spent half a day with the paint-guns, and then switched to the assault rifles. Everybody had seen at least one chapter of the Star Wars saga, so they had some idea of what the assault rifles.