I want both

Ok me and my fiance have been together for the past 8 years engaged for the past 5 and I love him to death we have moved in together and are talking about kids later but at the same time9 when his best friend (only friend at that) comes over when he's gone we end up playing with each other it started off very innocent the occasional look or work but lately it has been getting harder to say no to him about sex in fact I've found my self at times begging him to make love to me in fact I'm going over to his house this Wednesday to have some fun and he asked me to bring a rubber I don't know what to do I want to have both

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Update: it turns out Apparently were doing a threesome once I get used to having two at the same time