This VN does have some spicy content but there's no explicit artwork, so I'm not sure if I'd class this as erotica personally. I wouldn't even call this r18: I think it's more like nc-17.
Steam is pretty strict about tagging games with adult content appropriately and I wasn't asked to tag this as AO on Steam at least, so I didn't tag it as AO on Itchio either. I do have other BL VNs which are more explicit than this though 🙏