Ben woke up in the shower, his belly full of his own seed. Ben stood up and reached between his legs, and let out a slow groan. Ben stepped out of the shower and walked into the room. Jerry was asleep, when Ben came over and sat down on the bottom bunk and nudged his shoulder. Jerry slowly opened his eyes, then slowly sat up in the bed.
Ben's face was quite angry, "Damn dude, what did I do?"
Jerry nodded slowly, "Relax. I treated you to one possibility. Now it's time for another. I suggest you fight the urge to use your new pussy, the harder you resist the more you change." Jerry was now sporting a smaller version of the dream cock Ben no longer had.
Ben growled, "That is ...", and then dropped his head in acceptance. Ben's nipples had already changed, and were now quite large and puffy. His breasts were slowly swelling. Ben went to the shower, and turned on the cold water.
Jerry smiled and laid back down on the bottom bunk. Soon, the shower water stopped, and a dripping wet fully female Ben came into the room. Jerry smiled, "That's better." Jerry pointed to the towels, "There's a towel."
Ben grabbed a towel and dried off. Ben opened his drawers to get some clothes, but the drawers were empty.
Jerry pointed to the bathroom door, "Take what is on the back of the door, it's one of my favorite. We are the same size now, so we will wear the same clothes. It's my mentor rule. I suggest you learn to like this, it will make it easier. You can make the choice to accept things now or you will only have once choice, my choice, later."
Ben took the hanger off the back of the door and slipped on the bikini bottom and long sleeve top. Ben felt a throbbing between his legs while staring in the mirror. Ben said nothing as he went over to the bottom bunk, and crawled on top of Jerry. Ben pulled the bikini bottom over to the side, and slowly slid his now fully lubed pussy down on Jerry's cock. Ben gasped softly when he was fully impaled.
Jerry grinned, "Anytime you have this urge, I will fill you up."
Ben felt the throbbing of Jerry's large cock stretching his pussy. Ben was slowly losing his internal struggle. He was lifting with his legs and began to slowly piston up and down on his dream cock, now inside is pussy. Ben fully gave into the act as he was now furiously sliding up and down Jerry's cock. Ben was feeling his own orgasm build and was slamming down with each piston when Jerry's knot swelled and locked Ben in position, as Jerry filled Ben with his warm seed. Ben was denied his orgasm, but was squeezing the knot buried in his pussy as he fed his hunger to have his pussy filled and stretched.
Jerry patted Ben's check softly, "That will Ben, that will do," and Jerry relaxed under Ben's very supple body. Ben closed his eyes and pushed his cheek into Jerry's caress. Jerry knew he had broken Ben's will to resist and that would be the key to Ben's success academically. Ben kept squeezing Jerry's knot, forcing the cock to remain rock hard. Jerry fell asleep and Ben rested on Jerry's body.
After a brief nap, Jerry awoke, with Ben smiling on top of him. "You kept me hard. I like that," growled a happy Jerry.
Ben pouted, "Yea, but your knot deflated."
Jerry asked, "How would you like to walk around and not feel empty?"
Ben responded with intense interest, "Tell me more, say with a big knot?"
Jerry nodded, "For your first day here, sure. If you make the grades and follow my rules, we can keep the options open. You can even ask for your old body back, if you want."
Ben was consumed in the lust of his current anatomy. Ben lifted himself off Jerry and slid off the bed.
Jerry pointed to a drawer, "Get the green one. Deflate the knot fully when you insert. It will get as big as you can stand once inside."
Ben opened the drawer and smiled, picking up the large green equine dildo with a very large canine knot, with an air pump in the base. Ben eagerly slid in the dildo into his slick pussy without bothering to deflate the partially inflated knot. Jerry was in the shower when a naked Ben walked in and joined him. Jerry reached between Ben's legs and gave the pump a couple of strokes, which caused Ben to shudder. Both stepped out of the shower no longer smelling like sex, and proceeded to get dressed in matching outfits, the same one that Ben put on earlier, and left the dorm room for class.