On the morning of our mutual exam, I strode into Rory’s room and found her heaving under her brother. He labored mightily to give her the fucking sh...e had been missing for nearly a month.“OOOOHHHH!! I’m Cummmminngg. Agggaaaaiiinnn!” She wailed.I didn’t have the heart to stop them. After they had exhausted themselves, covered in my son’s cum from heads to toes, I finally cleared my throat. “I hope you enjoyed that enough to last a lifetime, young lady.” I was oddly, suddenly furious. “I’m calling. A thick drop of pre-cum squeezed from his cleft.She watched it run sluggishly down the slope of his cockhead. Then she gathered the drop up with her tongue and purred with joy. She had figured right -- cum was even more delicious w�hen lapped up from a prick!She tongued his cock some more and lapped up another glob of slimy pre-cum.Now she figured that it was time to take the head of his cock into her mouth and suck him to a climax.She felt an actual physical hunger for his cock and cum, along. It was the perfect time to slow down for a switch.“Not yet,” I said teasingly, pulling away from him as his wet cock slipped from my hands, spit and pre-cum dripping towards the ground. He had worked me right up before pulling away, two could play at that game.His hands left my hair and were holding my shoulders instantly, gripping me gently and pulling me to my feet, not wasting a moment. He spun me around once more, this time so that I was facing away from him, towards the barn with him. The battalion also did what most units do when they have an embarrassment on strength; they dispatched me on as many courses as they could.The first course I had to attend, barely having time to unpack my kit, was a parachute continuation training course, carrying out the 8 jumps a year I needed to qualify for parachute pay. The course was now held at Tidworth, which like Warminster is on Salisbury Plain, but whereas Warminster had been a joy Tidworth barracks is a bastard. The only good thing.