Venice Strange/Drawlight, where Drawlight is nervous and trying to do his task of spying on Jonathan Strange, and Strange is in the throes of madness and still angry about Drawlight's scheme of pretending to sell magic lessons on Strange's behalf. Strange knows Drawlight's here to spy on him, but is not in his right mind to be able to handle and address this in a healthy way.

Full-con, dub-con, and non-con are all fine (though considering Strange's altered mental state it's hard to argue this isn't at least a little dubious.)