1boy 1girl armband bare_shoulders black_hair blush chain choker collar diablo_(isekai_maou) fingering green_eyes hand_on_another's_arm hetero highres holding holding_chain isekai_maou_to_shoukan_shoujo_no_dorei_majutsu long_hair lying magic_circle metal_collar navel on_back out_of_frame photoshop_(medium) rem_galeu solo_focus sweat tears tsurusaki_takahiro upside-down vaginal wavy_mouth