All depends who it is, I’ve been wanking before now and had someone nearly walk in mid wank and I’ve carried on as under the bedsheet and they can’t see and have changed direction and not walked in after all. Also got walked in just as I came, luckily again under the covers and there was only me that knew what had happened thankfully! 
One of the videos we shot together was my partner laying on the bed, legs spread using her wand, and I walked in the bedroom, whilst telling her to carry on.
She did, whilst I stood beside the bed stroking my cock, till I came over her, whilst she was still using the wand.
I also often lay in bed, wanking, when she comes into the room, whether that be after a shower or just as we’re going to bed.
Thankfully she’s got a high sex drive, and if anything, I think it turns her on more than me. Which is good!
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Depends how close i was to finishing.
Was caught by my girlfriend watching porn and masturbating didn’t hear he come home. She liked it and helped me finish
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