bbPress.org

if this isn’t possible, I totally understand.

no its possible , i forgot some periods though.

Here should be the full code , not shortened though.

#bbpress-forums div.bbp-topic-content a,
#bbpress-forums div.bbp-reply-content a {
    color: blue;
    text-decoration: underline;
}

if it still doesnt work , post a topic that has a couple links in the replies and topic post and i can find some CSS that would work with your theme.