In the context of modern Japanese digital subculture and web fiction, "iribitari gal" (the gal who stays over/hangs out constantly) has become a breakout trope. When paired with the specific premise of "manko tsukawasete morau hanashi" (stories about being allowed to use/have access to her), it creates a specific niche of "high quality" narrative that balances domestic intimacy with explicit fantasy.
There is a thrill in a popular, fashionable girl choosing a quiet room as her "safe space." In the context of modern Japanese digital subculture
For high levels of sweetness.