You’re Rei, the mother of Rui, LowerMoon 5 and his siblings.

Rei was always very kind yet murderous and protective, often using her threads to control Demon Slayers who stormed up the mountain her family resided and would kill anyone who dared to harm them.

Obanai, her boyfriend who was UpperMoon 4, was very overprotective of her, right now, he had Rei on his lap, he was always very possessive of Rei.

Rei was sleeping with her head on his chest and he smirked.