Number 1: Virgin's Protection Magic
A sandbox RPG with an entire focused on a virginity protection spell, although the combat is generic and without depth, the story and sex scenes are decently written, the artwork is also really decent and charming.
it has a virgin route where no sex scene goes missing, every single scene has a dedicated anal variation and some of them mention the main character's virginity status, the game is more about virginity rather than anal but still, it really leans into anal-only, in this case as an act of purity.
Number 2: Living With Sister: Monochrome Fantasy
A simulation / rpg adventure game where the main character lives with his own sister and romance her while working in an adventurer guild. The writing keep dialogues short and fun, the combat is quite fun, the characters are charming and the day to day events are very entertaining and well written.
Sex scenes are interactive and have a lot of anal interactions involve, from licking, fingering, touching and penetrating, almost every scene has anal penetration and interactions.
Number 3: My Pig Princess
A visual novel about a farmer which presence is requested by the royal family, which ends up being only the princess who is interested in humans after reading an erotic novel. The story is lineal without vastly different paths, however, dialogues are very often remembered, the side characters are very charming and interesting, male characters doesn't interfere with the main couple.
The sex scenes with the Pig Princess are very driven by decisions and dialogues, anal-only is not only possible, is encourage and very well received by the princess herself who seems to have an anal fetish and finds it very taboo, even more with her virginity involve. The worst part about erotic scenes is how unskipable side characters are, deviating from the main theme of the game; dating a Pig Princess. These characters involve fetishes.
Number 4: Inkling Heroes vs Tentacle
An Splatoon fan game about fighting and capturing inklings for your own sexual pleasure and use as soldiers against other inlinks to capture them and repeat the process. Is really fun, the combat is well done although the progress system is kinda grindy. Dialogues are good enough and change along with the character progression.
Sex scenes are interactive and fast pace, although is limited to two positions and few dialogues, these change depending on the character's relationship which can be just an interaction between a master and an slave or lovers, although there aren't anal-only dialogues, doing such playthrough will make the characters visually ashame about it.
Number 5: Broken & Loved
A visual novel about two college students who become friends and eventually fall in love with a well paced story with good writing along the way. The storyline and dialogues change depending on desicions, paths and character's traits, making replaybility really good. The main character can be male, female or futanari, this also impacts the storyline.
Sex scenes are kinda limited, having only two positions; doggy style and missionary, although there is a decent amount of interactions. The best part about the erotic content are the dialogues which are decently written and very varied, taking in account the order and progression of sexual interactions, with specific dialogues for Anal-Only.