Dang, you don't see that often in a manga, NTR but with the girl being on the receiving end instead, and she's got it bad too. So much of a fetish that she's subconsciously smiling at the thought of being blood cucked.
Yeeess Steal it girl ~, Make Her Feel the Feelings of Getting Ntr and Embraceee itt HAHAHAHAHAH
( i genuinely worried for my own mental at this point )