Realized there's a typo/confusion/what-have-you in the WT. At Day 20 Night, it states that "if you told the truth/lied about Alice." At no time does this happen, but thinking on it, I realized it may actually be referring to The Talk on Day 17, where you can lie or tell a half-truth. I happened to choose half-truth.
At Day 20 Planning, you can tell the truth/lie to Tracy about using the spell; I chose lie. To my confusion, I got the solo anal scene at night. When I went back to the Tracy decision, I went with truth and then got the threesome scene instead.
So the "told the truth/lied about Alice" statement seems to be a mashing together of "lie or tell a half-truth" and "the truth/lie to Tracy" ideas. I do not know if this would change if you go with lying instead of half-truth, but the threesome scene dialogue seems to indicate that it would.