There's a number of different reasons. For one the girl wearing the strap on might enjoy the feeling of dominating whoever's sucking her off. In some cases whoever's sucking it might just get really turned on from having cock, real or fake, in their mouth (I know I do, sucking off my dildos gets me really hot). Then there's the cases where it's all in the script. All the reasons you put are totally valid.
Strap-on porn! why do they suck the toy & act like it feels good?
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There's a number of different reasons. For one the girl wearing the strap on might enjoy the feeling of dominating whoever's sucking her off. In some cases whoever's sucking it might just get really turned on from having cock, real or fake, in their mouth (I know I do, sucking off my dildos gets me really hot). Then there's the cases where it's all in the script. All the reasons you put are totally valid.