Givin him oral

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Okay, so my BF asked me to swallow his cum for first time. I agreed. The taste wasn't too bad I wasn't sure what to expect. But I kept gagging, not so bad that he k ew I was gagging. Does the urge to gag go away the more you do it? Like I said the taste didn't really bother me I don't know why I gagged. Does anyone else have this issue? Thanks in advance.