Jenny acts before I can

I completely froze when she asked me that. It was already crazy all this was going off without a hitch with my sister and her friend. All I did was say a ridiculous wish out loud while on a random website! I still knew with absolute certainty I had 'the power of freeuse', but I couldn't believe what that seemed to entail. Jenny and I had never even talked that much before this; I was just her best friend's brother who was around sometimes because we lived in the same house. At most, we had maybe watched a couple movies together and commented on them. And now she had just being jerking off to me playing with and kissing my sister, all as if this was entirely expected.

All I knew about Jenny's roommate was that she existed since Jenny lived in a dorm. Jenny had already turned away from the camera before I managed to collect myself enough to respond, her shirt dropping down but otherwise doing nothing about her half undone clothing, and was tapping her roommate's shoulder.

Her roommate took out some earbuds, not even bothering to turn around. "Yeah, you need something?" she asked Jenny over her shoulder.

"My best friend's brother is using her, and he wants us to watch and enjoy," Jenny told her, as if this were completely normal.

"Wow! One sec," she replied, clicking a few things on her computer, then turning around, looking her roommate up and down, but not freaking out at her roommate's disheveled appearance. "I guess that means he wants to watch us get off, huh," she added, pulling her chair over next to Jenny's.

"WHAT THE FUCK?" I half yelled, watching her causally pull up to the camera next to Jenny, who was pulling her shirt back up.

"Something wrong?" she asked, looking confused. She reached inside her sweatpants and undid the knot at the waist. "I'm Debbi, by the way. Thanks for using me." Debbie was tall black girl, taller than Jenny, with much larger boobs than either my sister or Jenny. I thought she might be heavier too, but she was in very loose sweats, so I couldn't tell much outside how much her boobs pushed her shit out. Her hair was very short, but a bit frizzy.

"You don't find anything unusual here?" I asked incredulously. "Nothing wrong or objectionable?" I added, tweaking my sister's nipple.

"What do you mean?" she replied, looking confused.

I couldn't hold it in anymore. "Look, we've never met. I don't think I have even heard a single thing about you before now, and you haven't about me either, right?" I continued. She nodded, looking confused. "And now you are getting ready to play with yourself on camera for me. Doesn't that seem odd?"

"No?" she replied, looking even more confused. "I'm not sure what you mean. Jenny said you want to use me by having me jill off to you fucking your sister. I assume that's the topless girl with you on the phone? What would be wrong about using me?"

"I... you..." I spluttered.

"Are you ok, bro?" Amy asked. "You know, you waited months to use anyone, but I thought you were just nervous. Why are you acting like this? Do you feel sick or something?"

"What, no I feel fine sis," I replied. "It's just... you know, it's the first time, so I am just making sure about everything."

"Stop being all weird," Jenny put in exasperatedly. "What is there to be sure about? You want to use us, so use us however you want. Unless you don't want to use us after all?" she asked, beginning to lower her shirt again.

"No, no I do," I put in in a rush, afraid of breaking this spell.

"Well get on with it, then," Jenny huffed. "You mind if we lose the clothes? It's kinda awkward playing with myself like this, and anyway I'm sure you wouldn't mind a better view when you use us," Jenny added, as if asking if I wanted a drink, not if I wanted her and her roommate to strip so I could watch them jill off.

I shook my head, then nodded, and then added "strip" when she gave me a confused look. Jenny quickly pulled her shirt and bra the rest of the way, off, and kicked her and bounced a bit in her chair, probably kicking her jeans under the deck. Her roommate had more to do, pulling her hoody over her head, then unsnapping her bra, leading to a stupendous boob drop, as they were even bigger then I thought they were. "Oh, you like my big titties?" she asked with a giggle. She pulled her sweats and panties off in one go, turning around and giving my a view of her ass as she threw them onto her bed across the the room. Jenny got my attention again by sliding back slightly, spreading her legs, arched her back, and using two fingers to open her lower lips so we got a good look at her pussy as Debbie sat back down.

"Well?" Jenny asked. "You said you wanted to use us to enjoy watching you play with Amy, but your just staring at us. Change your mind? Did you just want to stare at our naked bodes?"

"Would it be a problem if I had changed my mind?" I asked, worried that I somehow had to follow through with my original statement or whatever this was would stop working.

"Why would it be a problem? Any way you want to use me is fine, just let me know what's up," Debbie added expectantly. "I can't help noticing we're naked and she's topless, but you still got all your clothes on. Is that a thing with you? I think I saw that on the internet somewhere..."

"Clothed Male, Naked Female," my sister put in, surprising me. "What, because I'm a girl, I can't look at porn sometimes?" she added when I gave her a surprised look. "Not my thing," she added.

"Look, I have homework to do," Debbie put in. "Sure, the teacher will let me turn in late if you were using me, but I'd rather not. If you changed your mind, just let me know so I can get back to it."