The eastern window let in the light from outside, softly illuminating Izumi's white naked body as she lay on her back, her head turned toward the window.
The swell of her breasts rose above her chest, their surfaces painted with gradients of shadow, while her stiffened nipples - erect from stimulation - stood like twin sundials pointing straight up, though what lay beyond them was not the blue sky but the low ceiling.
Yu and Izumi lay tangled together, naked, on the built-in bunk bed in his room.
It was the same place where they had become one for the first time just over three months ago on the day of their high school graduation.
Although they were now attending different universities, they had continued to meet and get together every chance they could.
And almost every time, it had happened on this bunk bed.
From the window just above the loft's floor, they could see the adjacent city park.
Due to the terrain, the park had been built on slightly elevated ground, so that it was almost at eye level with Yu's room on the second floor.
This time, Yu had deliberately left the curtains open.
As he stroked Izumi, he glanced up to see children running across the grass, and joggers and walkers of all ages following the brown path that circled the open space - all at the same level as them.
It was nearing evening, and from her perspective, the people gathered in the park and the trees scattered throughout the grounds seemed to glow in the golden sunlight.
From the direction of the park, his house would be backlit, making the inside of the window invisible - but the thought still sent a ticklish thrill through his chest.
"Hey, look," Yu urged.
Izumi craned her neck to look out the window.
To her, the families playing ball, the elderly relaxing on benches, and the children on the playground equipment in the distance must have appeared upside down, shimmering in the light.
"Stoop... it's embarrassing..."
She squeezed her eyes shut, shook her head, and curled up into a ball.
Just then, Yu's middle finger was buried deep inside her, smooth and warm, and as she clenched around it, her walls tightened sharply around his finger.
"Hey... can't we close the curtains...?"
"It's okay. They can't see us from outside."
With his lips around one of her nipples, Yu flicked it with his wet tongue while his glistening fingers traced slow circles over her clit.
Izumi squirmed, though whether it was from his touch or the shame of knowing the curtains were still open was unclear.
From the start, the idea of being exposed like this had sent her into an unusual state of arousal - her skin flushed, her wetness undeniable, her sensitivity heightened beyond anything before.
Yu took advantage, torturing her more relentlessly than usual before he spread her legs wide and buried his face between them.
As his tongue worked, he looked up.
Beyond the rhythmic rise and fall of her stomach, her breasts swayed with each shuddering breath.
And beyond her jawline, framed like a bright square, was the vibrant, sunlit world outside - the everyday world, dazzling in its clarity.
Beneath the break in the clouds of the rainy season, crowds of people relaxed in their own ways while Yu and Izumi indulged in their secret act.
Even as they did so, Yu could feel Izumi's trembling growing more urgent, her breath hitching, her sweet moans building to a crescendo.
"Okay... I'll do it."
"Mmm... come on... but please close the curtains..."
Yu covered himself, but still didn't close the curtains as he lowered himself over her and slowly pushed himself inside.
Her unusual arousal seemed to reach even her innermost depths - her heat, her wetness, her tightness, all different than usual.
As he pushed deeper, Yu murmured, "Look up... look outside again."
Gasping, Izumi obeyed, craning her neck once more to look out the window.
Just a few feet beyond the glass, children laughed as they played with battery-powered bubble wands, sending countless shimmering spheres into the air.
The bubbles floated upward, passing through the shadow of Yu's house before catching the light, iridescent as they climbed higher.
"Nngh-!"
Whether from renewed shame or overwhelming pleasure, Izumi's inner walls clenched around him again.
But it wasn't just that - she was already peaking, hurtling toward a climax.
"Ahh- ahh- I'm- I'm gonna- I'm gonna cum-!"
Her whole body shook violently.
Yu held her tight, his own movements accelerating as he clung to her, riding the same wave of pleasure.
"Ah-!"
He couldn't hold back a scream.
In that instant, he poured everything he had into her, releasing deep inside with a shuddering climax.
For a few fleeting moments, their breaths, their heartbeats, the tremors of their bodies - all synchronized, as if they had melted into one.
...
When it was over, Yu pulled out and lay beside her, stroking her skin as he kissed her.
Then he glanced up at the window and nudged her to look, too.
Outside, the usual weekend scene in the park remained unchanged.
The only difference was that the shadow of the house had stretched a little further across the grass.