Is it normal that i hump my plushie?

Ok so, this is gonna be hard to explain. I'M A GIRL, btw. I'm 23. And I have this plushie that I made (handmade) of a character that I made up and who I am in love with. And basically I take him to bed every night and sleep with him and cuddle him. But like last week I was horny and decided to hump that plushie, and I felt really good, better than doing with fingers. I kept my underwear on while I was humping him, and came quickly. I also did it again last night. But I'm worried about ruining him or making him messy/dirty :/ I love the way he feels when I rub my clothed cl*t on him. But I just love this plushie and he's special to me like one of my most prized possessions :( And I swear I only humped him with my underwear on, but I felt like afterwards when I looked there was a tiny wet spot on him but it's not noticeable now. Is this really that weird? Am I alone in this? And don't say get sex toys or whatever because I live with my parents and still can't buy stuff online so that's out of the question. I'd be way too paranoid owning sex toys. And it wouldn't be the same. Is it normal?