Silas Weir Mitchell and Bree Turner

It's not "Muskrat Love," but Grimm is staging a romance between two of its muzzled creatures.

On Monday's episode (10/9c, NBC), Wesen pals Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) will finally take their mutual admiration and gentle flirting to the next level for a romantic picnic. "Monroe finally asks her out on a date, and it's all very, very sweet," Turner tells TVGuide.com. "She feels a little shy about it and is a little overwhelmed with how amazing Monroe is and how romantic he is."

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Rosalee, who is a Fuchsbau or fox-like creature, has been an important addition to Nick's (David Giuntoli) crime-fighting team, providing Wesen drug knowledge, supplies and remedies from her apothecary shop. Despite her seemingly mild-mannered nature, Rosalee will reveal another aspect of her personality on the date. "Her wild side comes out," Turner says. "It's going to be a big surprise to the fans how Rosalee likes to get down."

Beyond just navigating interspecies-Wesen dating — Monroe is a Blutbad or Big Bad Wolf — the budding couple will also have to contend with their respective personal issues. "Because of her past, it's kind of scary for Rosalee to really open herself up and possibly have her heart broken again," Turner says. "You saw her ex-boyfriend came back last season. Clearly there was something very broken about that relationship. You see that with Angelina and Monroe also. We both have had these relationships that have really destroyed us, and here we are trying to do things differently with someone else."

Unfortunately, when you're friends with a cop who is also a Grimm, events sometimes interfere with romance. "The date is definitely not going to go down the way they think it is," Turner says. "Some very scary sh-- starts to happen. Fans are going to be hit by a Mack Truck of unexpected revelations in this episode. There's some major Wesen business, but also forces beyond anyone's knowledge or expertise are being pried into. Everyone gets involved: Hank, Nick, Monroe, Wu.

"There is a very scary person, the porcupine man, in the episode who is all special effects," she continues. "It's one of the most impressive creatures I've seen on the show. It's just so gross, his transformation. He's the catalyst of a lot of the problems that happen in that episode. Things are very connected."

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Playing a fellow Wesen (albeit a less scary one), Turner also has to deal with computer-generated special effects when Rosalee transforms into her Fuchsbau alter ego. "I love my morph; it's so cute and it's not creepy," she says. "First, we do the whole scene just as ourselves, being told, 'More head shaking. Less head shaking.' And then we do the whole thing with tiny dots on our face. And then they do the whole scene with this silver ball in the space where my head [should be]. It's unbelievable how they do this stuff."

And although Turner doesn't seem to mind the morphing process, she has more difficulties with another signature aspect of the series: the faux Germanic language used to describe the Wesen. "It's a total headache," she says. "We have a dialect coach, but really, the final say in my opinion is Silas Weir Mitchell. He's an encyclopedia of odd information... Silas told me that they went to an event last year, and someone from the audience thought that I spoke fluent German. I've succeeded now with the show if someone really thinks I know what I'm saying."

Turner was only a recurring guest star during Grimm's first season, but became a series regular for its sophomore outing. "Fans could have rejected the idea of Monroe involving himself or having another player in the game," she says. "But a lot of people love the developing relationship between Monroe and Rosalee — or MonRosalee as I've coined it. But they're also responding to Rosalee and her intellect, energy and background."

Not only have the fans warmed up to her, but Turner has been embraced by the cast as well. In particular, she and Mitchell have an off-screen friendship ... and competitive rivalry. "He is Monroe. He's that intelligent, that funny, that sweet and charming, and so it's really no work working with him," she says. "He's also a very good artist, but right now, I'm currently beating him at Draw Something on my iPhone."

Check out this sneak peek of the Mon-romance from Monday's episode, "Quills," airing at 10/9c on NBC. Fans can also join Turner as she live-tweets the episode for the East Coast airing.