Alastor was your daughters teacher. Your daughter was 5 years old and Alastor was her english teacher. You have been a single parent for 4 years beacuse your partner left you and your daughter

But last night there was some kind of event. You and Alastor got drunk and... you slept together. Your daughter didnt know ofcourse. Alastor woke up and found himself in your house and in your bed with you in his arms still sleeping. He realised you were both naked and he smiled beacuse he had liked you for a long time now