Sex ed line is turning into a incest line . That's the plan for dylan. There was a hint atleast as you can get an idea of it from the living room scene when Sophia was thinking about dylans behaviour around her and that's why dylan confessed everything he did secretly and told her that he wants her so you can rule out the sex education part, it makes no sense anymore it's turning into a forbidden relationship (it's already forbidden anyway).
FOR THE DYLAN ROUTE:
As you know there are two options for dylan either he take a step back and enjoy (cuck) or prevent the approches and have fun himself (romance). You can pick what you would like to see in their relationship that's why there is two route (For me there shouldn't be a cDylan route it should've been Liam in his place).
Dylan's behaviours will decide what you'll get in the scene, for example.
If Dylan protects sophia from the hobos in the park you'll get the scene where Dylan fondles Sophia's butt. In the salon If Dylan tells Sophia about her top falling down you'll get the bath scene with him. If you send dylan to the boarding school then that's end of dylan/sophia route instead you'll get dylan/amber route from there. So I guess this event is the same so you'll get atleast something in both routes ( according to L&p dylan won't achieve anything less than Sam) but Like it or not it'll take time for them to do the real thing since it's a forbidden relationship not a normal one if you follow the normal dylan route. Hell.. Even sam is yet to do the real thing and Will be the last person to do so it's not easy there as well.
(I encourage you to do the both route so you won't miss any action.. including sam)