Hiya!! Thank you so much for the kind review! I'm glad to hear that you enjoyed playing Day 3 ♡
As for the NSFW inconsistency: I've actually explained this here on Tumblr (cw for descriptive NSFW talk), but the tl;dr is that Angel might've used toys on themselves prior to sleeping with someone for the first time — also, they literally had Ren's fingers inside them moments before, which obviously wouldn't be bigger than his... y'know.... ^^
For the "Dead End" in Day 3: Also explained here on Tumblr! Despite there being a ton of choices available for the player, the overall storyline for 14DWY is extremely linear and follows a strict path. I'd have no way of connecting the plot of Day 4 with Day 3 since it requires you to go on Teo's date. If Angel didn't agree, Day 4 would just be them sitting around at home all day — which would be boring to read about from a player's standpoint ^^;
You do, however, get three different Dead End scenes depending on how many times you get them! Ren says something different each time, which I thought would make things more interesting and "worth" getting the Dead Ends lmao
I'd also be more than happy to help you with any dev/Ren'Py related topics!! You're always welcome to ask your questions on my personal Tumblr (since it's not exactly 14DWY related fjsdjghs)!