Severus turned a bit, pulling his leg away from Alecto's hand, and pulled at her wrist some. A twist this way and that, then he released it.
He'd been Marked two years after graduation, she'd have never seen it on him, granted, she'd had never seen it regardless but it was worth considering, seeing as he was rather sure she'd been the same not more than a year before after himself.
"How old are you? Eighteen? Seventeen?" Severus asked, taking a seat slowly. At that realization that she wasn't a Death Eater, he felt that familiar discomfort creeping back in of being around a school peer and grew very quiet, very quickly.