Marshan looks at the girls at the door. They're at least cute and friendly, unlike the prissy, tramp stamped dark elf. They also are carrying proper polearms. Since they are friendly, they must not be from this retched little town. "I am Marshan. Come in." Telepathically, "Toddy, watch out for other people snooping around or watching the house." "Yeah boss. And hurry up with those tarts."
Once the girls are in the house and the door closed. Looking them over carefully while evaluating his words, (and they pass the sense motive via fiat) "There is something weird going on in this town. The professor was investigating an evil cult. He was starting to make progress and we think they killed him because of that. We have started our own investigation, but progress is difficult in this backwater town. More and more evil is cropping up, and if we are not witnessed as actually putting it down, we get blamed for it. The sheriff shows up, we explain how we fixed the problem, not caused it. Another problem, another visit. La-di-da. So, If you are interested in defeating evil that will probably eventually kill you, then do nasty things to you, you can help us. If this scares you, run out of town as fast as you can." He watches them carefully to see if this spooks them.