I have a wonderful best female friend and I have on several occations taken her used panties, sniffing them while masturbating. Once when we were on a holiday she was going to have a shower and put her clean underwear in the bathroom, but I said I wanted to have a shower first so she said sure go ahead. Her panties and bra was lying on the toilet seat. I was sniffing them, even though they were clean, but the thought of her going to wear them was such a turn on. I got very aroused, fantasising about kissing her slim body...i have once seen her nude so I know what she looks like and her body is sooo slim and sexy. I imagined sucking her perky tits and her stiff nipples, and licking her pink wet pussy. I realised she was going to wear her underwear soon and knowing that my cum would be rubbing against her tits and pussy was sooo exciting. Soon I felt that familar warm tingling sensation in my balls and by now I was wanking more intensely. Soon I exploded in a wooonderful orgasm, shooting several streaks of my cum into her panties and bra. Then I shaved and had a shower, and before I left the bathroom I checked on her underwear and saw the cum was not too obvious, the white had soaked into the fabric but both her panties and her bra were quite wet. I was panicking because I knew she would notice. A couple of minutes after I got out she got into the bathroom and I heard her undressing and getting into the shower. Then when she was finished I heard her shouting at me sarcastically "can you make a more mess when you shower? you made my underwear wet". My god! I was lucky, she didn't realise the wetness came from my cum. I heard her dress and soon she came out, holding her used underwear in her hands. So she had put on the cum-stained bra and panties after all! I asked her outright: "does it feel weird to have wet panties on?" and she looked at me with sparkling eyes, giggled and said "yeees sweety but i sometimes get a little wet from being horny so im used to it hihihi". This was such an unbelivable turn on. Later that day I was masturbating two more times from the excitement, and both times I was sniffing her used panties.