Top & Tail
Dipper and Pacifica are forced into a tight situation on a college trip. Sharing a narrow single bed, sparks will fly, and both of them will try to overcome the other.
Despite the archive warnings, the first chapter is entirely SFW. All NSFW content is saved for chapter 2 onwards.
After the initial 2 chapters the remainder are largely episodic one-offs, with some loose serialised character elements.