Sex Training Camp With BB-chan
"Intro"
https://sirosoil.fanbox.cc/posts/5247093
"Blowjob Chapter"
https://sirosoil.fanbox.cc/posts/5336517
"Titjob Chapter"
https://sirosoil.fanbox.cc/posts/5439502
"Thighjob Chapter"
https://sirosoil.fanbox.cc/posts/5534231
"Straight to Sex Chapter"
https://sirosoil.fanbox.cc/posts/5892338
"End"
https://sirosoil.fanbox.cc/posts/5892422

1-195: Main story
196-354: (Mostly) Textless of paywalled chapters

I wanted to call some attention to Sirosoil again, since he's still actively making FGO fanart. Last year, these multi-part sets got paywalled featuring Gudao and BB doing a hot springs training camp for eventually having sex. They end up having sex anyway. Another user uploaded the titfuck set a while ago, but to my dismay, not a full compilation like this one.
Sirosoil's anatomy takes some getting used to, but I'm rooting for him to continue developing. I hope you'll check his work out, free and otherwise.