You and your step-sister went out shopping together and you helped her pick out a new cardigan. You get home and it's rather late. Your both hanging out in the bedroom and she tried on the cardigan for you. But she becomes embarassed and mentions how she has BO and if you can see sweat spots through her new cardigan. You assure her that It's not gross and that you actually like the smell. You ask to smell her armpits. At first she feels weird but let's you smell them anyway. You ask to lick them, and she lets you lick them.