As I opened the door I found Kat standing there. She is my best friend.
She is a vet I met when I helped a dog that I found injured shortly after moving here. Soon after I found out that we were neighbors and ended up becoming very friendly.
But tonight she was acting differently than usual. As if she was nervous for some reason.
"Don't stand there Kat, come in." I said. She entered. I guided her to the living room and asked "Are you OK Kat? You seem to be worried about something."
Kat hesitates a little and says "July, you are a really good friend, and I have a really big secret. I want to tell you, but I'm affraid of your reaction."
That was a surprise, we were best friends, I believed that there wasn't more secrets berween us, but if it was a subject she had difficulty dealing with it should be very serious. "You know you can trust me. I promise I won't tell anyone, whatever you tell me."
Then Kat, gathering all the courage you can said "I know this is going to be hard for you to believe, but its all true."
"Now you're making me worried." I told her
"I am not from this planet, or, as you call here, an alien." Kat said
That was really unexpected, I was mute not knowing what to say for some minutes. Kat was also silent waiting for an answer from me.
After some minutes I finally asked "But, how? Either way I look, you still look totally human to me."
"Luckly to us, my race and humans are very identical externally. But I can prove that I'm telling the truth." Kat said, then she got a needle in her purse, pierced her finger and showed it to me. There was a small amount of blood that came out, but, instead of red, Kat's blood was green.
"That's enough for me, but then why are you on Earth? Do you intend to invade the planet?" I asked
"No no no no. That is not our goal. Although if it were, we would have done it several years ago." Kat said "But for you to understand better I'll have to tell a brief story about my home planet."
I always wanted to find aliens, but never expected that best friend to be one, at this moment, the initial shock has given place to the excitement to know more.
"About a thousand years ago, according to Earth's calendar, a large asteroid grazed our planet, it caused no severe damage to the planet itself, but it had strange radiation that eventually affected all living beings on the planet in a way that could lead to extinction in a few decades. Luckily, our space travel studies were well advanced, and soon we began looking for other inhabited planets."
"What could be that serious?" I asked
Kat blushed and took of the dress she was wearing, leaving only her underwear on. Nothing seemed out of place until I saw the bulge in her panties.
"Are you a man?" I asked
"No. I'm a woman. This is because os the asteroid's radiation. All living beings ended equipped with male reprodutive system, no mather if its a male or female. Our travels though the universe are to find partners and reproduce our species." she said
"But. How telling all this to me can help?" I asked
"Well, due to the culture of my people, we don't like any forced union. So what I mean is ...." Kat blushed again and said "I fell in love with you."
"Whaaat?" I asked in surprise. I considered myself bisexual, so having a relationship with a woman would be no problem, but I never expected one wanting to form a family with me.
"I knew you wouldn't like this." Kat said
"No. Its not that I didn't like. I'm only surprised" I said
"So, you accept my feelings." she asked
"Yes" I said. As soon as I answered her, the bulge in her panties began to grow hard. "Ohhh. Only this just made you in the mood."
I wanted was horny because of this to, then I removed her panties as her cock reached full erection. Her cock was 8 inches long and her testicles were of the size of tennis balls. As her blood, her cocks tip was green to.
I wasn't ready ready to risk getting pregnant yet, them I just gave her a blowjob. Her precum hed a different taste, it remembered of mint.
It didn't long before she announced that she was going to cum. Her shot were so big that I failed to swallow it. Because of this I was able to see one more thing she had different from humans. Instead of white, her cum had a light blue color.