Yes, there are of course many ways to interpret that quid pro quo, and I bet he chose the wording to make it ambiguous and... teasing.
In the simplest interpretation Sophia has already done the
quid and now she is trying to cash the
quo, no other strings attached. As you said, the "something like my cumare" lets one think she is not "full cumare" but at the same time he also says "your wish is also my wish". So that wording does not help to make it clear. Assuming she is, Morello should just pay the favor and that's it, end of story.
Then obviously there is the more intriguing interpretation in which there will be a discussion/bargain about something that Sophia has to do again in return, i.e. the
quid and the
quo have both still to be done. Probably something that Morello will cast as a "small favor" to compensate the gap between what she is asking and what he feels he owns her after Larry visit. And there could be a choice for the player to make, as you said, the proverbial lesser of the two evils.
I think that both are perfectly possible for what we know, the second one opens more interesting (story-wise) options for sure. And adds another layer of complexity (branches, dependencies etc) to the story and more development.
Ironically, even this is a choice between the lesser of two evils