You climb onto the bed, and onto Tanya. She was indeed sleeping deeply, and by the time she wakes, you are in position with your staff just about to enter her center of paradise.
"Hey! You should ask a girl first." she protests. But even as she says that, she spreads her legs to allow you better access. Taking this as adequate permission, you plunge your member all the way into her. "You still didn't ask permission." she chides. However her legs wrap around you, suggesting this was not a major sin.
"OK," you respond as you slide back out, "Mother, may I?"
Tanya hesitates just a second, just long enough to let her claim she might have said no, but not long enough to risk you actually stopping, before giving 'permission' to continue. And again you bury your sword to the hilt.
It is followed by a great many more buryings of course. But even so your excitement rapidly builds and soon you are sharing a sweet simultaneous miracle. Very good, but you want more, and so after a moment to catch your breath, you get back to work. The creature with two backs is still in business.
Tho Tanya is dripping with sweat, you are the one who eventually collapses from exhaustion, right after a massive mind-blowing explosion, and you roll off. "Ah, is the poor boy tired?" Tanya asks with questionable sympathy, but at least with a smile, "Let's see if we can do something about that..."
Her hands move delightfully to your soldier, who starts to stand at attention. You lie back and enjoy Tanya's stimulating efforts... until you hear her say "!@#$".
Looking up, you ask Tanya, "Something wrong?", before you realize that Tanya's hand, which had been caressing your equipment, is now in your tool, which has expanded to record size.
"Nothing wrong for you," Tanya glares at you, "This is called cockvore and you are going to really enjoy pulling me into your balls." She is right about that as you now shoot off. "And your juices somehow are too sticky to let me get loose while being slippery enough to make me go right on in.", a statement verified by the tip of your vital part now being close to her elbow.
You don't really mean it, but ... "Any way I can help?"
"No, not now" Tanya admits, tho she seems to blame you anyway. "I got careless and so I go in. Now you might put Penny into your other testicle."
"Won't she object?"
"No." Tanya explains, "You are going to be emitting some hormones that just make us girls go crazy. You'll be able to take your pick about who joins me."
Another spurt of your come hits Tanya in the face, and now her head starts to enter your pride and joy, which cuts off conversation. But not enjoyment. You climax twice more before you reach Tanya's magnificent mountains, where she enjoys her own completion. And you go over the top twice more before those beauties are completely out of sight, the last explosion being a frenzy of simultaneous explosions.
Now your staff is two - three feet long, and still growing. You watch as Tanya's torso is engulfed, and Tanya's hand stimulates her fiery furnace. Both of you enjoy massive climaxes before your reach Tanya's fine hips. Now Tanya is lifted off the bed and her legs forced toward the ceiling. Soon those legs are kicking in excitement. They kick again as your piece expands to reach her knees. They try to kick again, but now only half of her calves are still outside.
Soon you are looking at your soldier, which is maybe seven feet long, and shaped like an attractive nude Tanya. But now it starts to shrink and flatten, and your left ball starts to expand. At first you fear it will get larger than you are, but it gets no larger than a big watermelon. That's still enough to keep you in bed, but it now starts shrinking until you are left with a normal set of equipment.
Now what? Well, Tanya suggested doing the same thing with Penny, which sounds great, but how? Wait for her to show? Or go out and look for her?