If you're looking for books with a similar vibe to 'Impregnate Me!', you might enjoy exploring the omegaverse genre. It's packed with themes like mpreg (male pregnancy), alpha/beta/omega dynamics, and intense romantic tension. Books like 'Heat' by R. Lee Smith or 'The Omega's Alpha' by Claire Cullen dive deep into these tropes, blending steamy romance with unique world-building.
Another angle is manga and doujinshi—titles like 'Love is an Illusion!' or 'Kiraide Isasete' offer that mix of drama, passion, and unconventional relationships. The key is finding authors who balance emotional depth with the fantastical elements, making the stories feel immersive rather than just titillating. Personally, I love how these narratives push boundaries while still centering character growth.