Hello Marine,
she gets mad but yet deep inside she would like it. maybe. get to that topic more relaxed. make her hot and then slowly slip that into the talk...she might be thinking you are testing her and she is maybe just pure and a bit prudish on it as you are her first.
you need probably to be home and start this with her or do a setup she does not know of with a trustworthy person.
there are so many things that could go wrong - have you thought of the negative possibilities ? if you are not there she would have maybe a lot of fear not being able to help herself.
the first experience like this would be extremely bad if she gets raped and you are the one who pushed her to try it.
i am sure you would not want that.
your imagination goes maybe that you will get and be excited in a positive way.
well getting another guy for her is not that easy.
my gf and me talked about the whole thing- from unwanted pregancies to STD's there is a lot of topics and then there is a relationship.
you want it - she does not . at least not now.
if you would for example make her horny with movies and also not fuck her for a week when you are home that would be a way to raise chances.
the things that could go wrong if she is not already cheating you and has a fellow such as other army wives...
- the guy could be abusive
- the guy could be trying to pimp her out
- the guy could take her from you if she is not totally drawn to you - and that is a point she might know better than you.
a woman that wants to belong to you does not want to do it; as many women in her state of relationshipknowledge connect an orgasm/sex with love...got it ?maybe not such a bad thing.
- possible STD's or/and pregnancy and the guy is not using ( maybe on purpose) a condom - in the heat of the moment.
why am i saying it ? well my gf and me had many talks about this - we considered it kind of for both sides.
she cheated on me - cried was afraid of losing me and had to abort as there was no will to raise some other's child.
slight parts of it made me horny we often spoke about it and we both had dirty talks in bed and still do about cuckolding 3sums gangbangs.
yes it turns me on in bed and makes my dick fucking hard. when she rides me she cums more than just one time...
but things leave a trace. be careful how you approach this and try to minimize the bad risks - there is still enough risk and
you cannot plan it all. it has a own dynamic and it might change.
cuckolding has not just positive sides and the majority works not in a longterm exciting arrangement for both.
she may not be the right one for it - or she is but not ready and needs you like a rock at the rough and wild shore to hold on to not to drown.
however i hope i could help you in whatever direction you will chose to go for.
good luck