'I feel some magic from them, so they can be somewhat resistant to my spells... But the animals are afraid of fire, right?' - you thought about upcoming battle and observe your opponents. After a minute or so of planning you came up with successful plan.
When the beasts weren't looking in your direction you jump from bushes and launch fireballs into larger and nearest wolves. Immediately air filled up with smell of burnt fur squeals of animals. The second small wolf charge into you, but you already expected this and with magic you jumped up and successfully stun this wolf. By this time the large one recovered a bit and slowly approach you, while the third wolf just fled away. you slowly step away from the large beast, you notice a large stone under him and idea popped in your head. You channel your force under this rock and when beast's head was right above the stone hit him with great force.
"Okay, looks like it's over" - you said looking at defeated enemies. 'Hmm, I think Lustria would like to look at this...' you thought, you pull out the special bag and with some efforts, as the beast was pretty heavy, you put it inside. This bag look like usual small cloth bag, but it had far more space inside than you may expect, and all things lose their weight while inside, all in all it's very useful thing.
Then you look at the another wolf, it's still unconscious. You haven't eat since morning and you can't leave it there, so there's only one way. You approach the beast and kneel before it. Then you lift it's head and open your mouth. You swallowed big things before, so you knew what to do, hold your breath and slowly push it in. The wolf's fur wasn't tasty but you didn't want to go back, so you continue swallowing. Soon the beast was in your stomach, it didn't awake so the process was quick. You was glad that your robe was spacious enough to cover your bloated belly.
A few hours later...
"Lustria, I'm back!" - you said opening the door to your home.
"Oh, great! So, had any news?"
"Well, in the forest I found few pretty strange wolves, I think you must look at it." - you give her a bag with captured beast.
"Hm, interesting... Okay, leave it to me and go get rest!" - said patting your belly.
Next day...
You wake up very refreshed, well it's true that you swallowed creatures before but you never digest it. You stood in front of your mirror and look at yourself. Though your meal wasn't very small you didn't gained much from it. Your breasts grown a little and you feel some volume on your butt also your belly got a layer of fat, but you still a slim girl.
"Good morning dear!" - said Lustria when you enter the kitchen.
"Good morning Master."
"About that wolf... Look what I found in it." - she place a dark red gem on the table.
"Oh! Isn't it a..."
"Yes. This is Demon's stone."
"So, this means that somebody wants to summon something from the Hell?"
"Yes, is is most likely version..."