Watch them

You: "I really would like to be present to make sure Sid´s not up to any funny business."

Alyssa looks a little disappointed. "It´s sad that you don´t trust me."

You: "I trust you! I just don´t trust Sid."

Alyssa: "Sid won´t do anything without me involved, so you not trusting Sid means you not trusting me, and that hurts." Alyssa has tears forming in her eyes, which breaks your heart.

You: "I´m sorry baby, I don´t mean it that way. If I could just watch you guys once, maybe I can also learn something?"

Alyssa wipes a tear from her eye, and says: "Yeah, okay. You can watch. So it´s alright with you if Sid and I move on?"

You: "Alyssa....you can also break things off with Sid and just move in here with me. We can move on to the next level together!"

Alyssa: "We´ve been through this baby, Sid is helping me, helping us, get through our mental hang-ups about sex, and sexual encounters. If we stop now, I feel like we would lose a lot of the progress we´ve been making. You do love my shower hand jobs, right?"

You: "Yes, of course I do."

Alyssa: "Great, so who knows what else I´ll be comfortable doing for you after learning everything what Sid has to teach me. Maybe even giving you blowjobs, wouldn´t that be great? I´m getting really good at them, Sid says."

Your dick twitches a little bit at the thought of getting a blowjob from Alyssa, to finally be the guy with her lips around his cock. The thought gets you so excited you blurt out "Yes, that would be great!". After finishing the sentence you´ve just realized you´ve given Alyssa permission to grind on Sid´s bare naked cock with her pussy until they both cum. That thought also gets you excited, for some reason. Oh god, thinking about Sid with Alyssa turns you on, what the fuck....

Alyssa: "Oh my god, thank you baby, it´s going to be great, I promise! Could we go over there tonight, you think? I know I was supposed to sleep over here tonight but I´m sure Sid doesn´t mind!"

You are surprised to hear this, a break from the rules? You were hoping to sleep next to Alyssa tonight, and maybe you could change her mind on this whole Sid situation. She wants to meet him right now, you have almost no time to digest this information.

You: "But I was looking forward to cuddling you to sleep tonight! It´s our night together, can´t it wait for tomorrow?"

Alyssa: "Pleeeease, baby? I´m so eager to learn the new techniques. Besides, the more often I do the lessons, the faster I learn them, and the faster we can stop the lessons, right?"