Persuaded my blonde sister to show her cap and have sex

Well, to be honest, my stepsister has a boyfriend and a couple of lovers at work. But a spoon is expensive for dinner, and a penis is when you want sex. Apparently my sister thinks the same thing, because when she feels the desire to get laid, she shows me her naked, shaved pussy and with all her might seduces me into sex. Well, since I myself am not averse to jerking my sister, very soon I lick her pants, then she gives me a blowjob and after that we are lovers, it seems not even for one or two weeks, but much longer!