It doesn't really matter. If you're on Sage path and choose to stay with her instead of Derek or Bella in the end of ep3, you'll have some scenes with the HOTs during the freeroam in ep4, including some chatting with Riona :
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But that's not really relevant. It doesn't improve your relationship with Riona since she doesn't have RP points. The same way, if you don't accept Quinn's offer, you won't get Riona's first lewd scenes in ep1,3 & 5 but again that's not a key point for Riona ( and considering you're pretty uncomfortable with the prostitution part, it would probably be more enjoyable for you if you don't take the number ).
The most crucial things to do is to talk with her about Cathy cluck and kiss her in EP4. Then confront her and give her money in EP5. She'll start to like the MC which leads to "her path".