I did a quick play through of the GW route with Lesbian Temptation. Was pretty informative. I got most of the scenes I normally do, except for some of the more recent ones.
If you send Dylan and Zac away (as is required for the GW route), you don't get to visit Alyssa's apartment. So this appears to end Alyssa's storyline, which I find rather disappointing. I guess we'll see next update. And of course you don't get the Ellie and Patricia kissing scenes.
You do however, still get the Nathalie and Vicky scenes, so if there is a threesome at the end of the GW route, it looks like it's with one of those two.