Of Course

You lumber towards the two male rat that are biting at each other and sit and watch for a while, finally one of the rats backs off only having 1 hp left, the other only having 4 hp. Thats when you challenge him. Seeing the females interest shift from victor to challenger the other rat chitters furiously at you and charges, but he doesnt see your teeth already flashing towards him. Bam you hit dealing 2 dmg and barely dodge around his teeth. From behind you now strike hoping that this works, and holy crap it does. You land a sneak attack dealing 6 dmg as he disappears in a shower of gold sparks.

Ding!

Lvl up Rat lvl 3

Strength 12 [+1]

Dexterity 14 [+2]

Constitution 10 [0]

Wisdom 12 [+1]

Intelligence 14 [+2]

Charisma 8 [-2]

Ac 10

Hp 8

Bite +2 to hit 3 dmg

Abilities- Sneak attack does 3x damage when unseen by enemies

Wow you are no longer a small rat but a plain old rat. This is a wonderful turn of events. Seeing that you are indeed the victor you take your spoils as the small brown rat offers her tail to you, the victory has made you hard and seeing the soft folds of her exposed and free to you, you dont hesitate one moment you sink in feeling the warmth of her envelope your now rather impressive cock. And you dont last long at all three strokes and you are pumping seed into this little breeding hole that you won.

Ding!

Evolution option available