I have a hunch/prediction that somehow makes sense. When Christine gave Dylan a blowjob, he quickly got hard again, and if... lp uses this tactic again, let's say Sophie gives Dylan a boob job and he cums, but because of the high sexual tension in the air, Dylan gets hard again and Sophie gives him a blowjob. (Well, I'm just trying to find something plausible that advances their relationship, but not too much.)
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Ummmm... on the ride home from the soccer game Sophia lets Dylan suck her tits. No real attempt to excuse it as "more sex education," but Sophia wanted some play time. The relationship is there.
The only thing that isn't plausible is Sophia stopping Dylan from fingering her. Now if this was the first time titty play was involved... sure the kitty is off limits. But... this isn't the first time of titty play and there is a HJ that took place... yah sure.
Now... to be fair Dylan climbing on top of her and railing her is a bit different and pretty consequential... if I recall right condoms are still a thing of concern in the game (yah been that long) and I don't see Sophia going,
I'M GOING TO HAVE CONDOMS ON ME JUST IN CASE I'M WITH DYLAN. Nor do I see Sophia thinking all of a sudden, it's now ok to go at it like rabbits with Dylan. I simply see if L&P has learned to write where Sophia and Dylan getting too comfortable with their relationship and KA-BANG! one night.
But considering it's L&P, and L&P's writing style it'll be apull out to where a condom would have been pointless in the first place... and in two years after much about a whole lot of tease, Dylan creampies Sophia