So your at home and get a phone call from your girlfriends mum asking if you would pick her up from the shops as her silly husband is stuck at work. She's so happy to see you and she mentions your dinner date the other week whe she seduced you whilst her step-daughter and husband was home. She appreciate she can rely on you and invites you in for a coffee whilst she puts the shopping away. She can't help herself she finds you so hot that she sucks your dick to show her appreciation (say name sam)