Mazoku no Futago wa Maid de Mesugaki

I take in two homeless demon girls that somehow wound up in my garden, and hire them as maids. From that day forth my condition deteriorated... and it turns out that they had cast a spell of charm upon me! ---- These were no ordinary twins... no, they were demonic lil vamps!! A manga about being sexually assailed by twin maids... Or perhaps turning the tables on them and showing them their place? Or perhaps not...? (Source: Dlsite translated)